[CI] Add external.yml to call workflow from ArceOS

.github/workflows/external.yml

@@ -0,0 +1,17 @@
+name: Externel Test
+
+on: [push, pull_request]
+
+jobs:
+  external-build-memory_addr:
+    uses: arceos-org/arceos/.github/workflows/build.yml@external_test
+    with:
+      # The directory to Top test, which need to be empty or not exist in this repository
+      CallerPackage: memory_addr
+
+  external-test-memory_set:
+    uses: arceos-org/arceos/.github/workflows/test.yml@external_test
+    with:
+      # The directory to Top test, which need to be empty or not exist in this repository
+      CallerPackage: memory_addr
+